A Defective Linear Pentachromium Complex for the Enhanced Catalysis of the Cycloaddition of CO2 with Propylene Oxide
Journal
Jiegou Huaxue
Journal Volume
37
Journal Issue
8
Pages
1305-1312
Date Issued
2018
Author(s)
Abstract
Based on the ligand (2,7-bis(α-pyrimidylamino)-1,8-naphthyridine (H2bpmany)), a linear pentachromium complex [Cr5(μ5-bpmany)4Cl2]PF6 (1, μ5-bpmany = 2,7-bis(a-pyrimidyla-mino)-1,8-naphthyridine) was synthesized. The crystal structure of compound 1 has been characterized by X-ray crystallography. Interestingly, one metal atom in the center is missing in this linear chain, leading to the defective pentachromium metal string structure which is similar with the reported complex [Cr5(μ5-dpznda)4Cl2] (2, dpznda = N2,N7-di(pyrazin-2-yl)-1,8-naphthyridine-2,7-diamine). The central Cr(Ⅲ) ion of 1 is eight-coordinated and is also rare in the chromium complex. The reaction of carbon dioxide with propylene oxide that generates propylene carbonate (PC) when catalyzed by [Cr5(μ5-bpmany)4Cl2]PF6 was investigated. Different reaction conditions including temperature and pressure were studied to optimize the reaction conditions.
Based on the ligand (2,7-bis(α-pyrimidylamino)-1,8-naphthyridine (H2bpmany)), a linear pentachromium complex [Cr5(μ5-bpmany)4Cl2]PF6 (1, μ5-bpmany = 2,7-bis(a-pyrimidyla-mino)-1,8-naphthyridine) was synthesized. The crystal structure of compound 1 has been characterized by X-ray crystallography. Interestingly, one metal atom in the center is missing in this linear chain, leading to the defective pentachromium metal string structure which is similar with the reported complex [Cr5(μ5-dpznda)4Cl2] (2, dpznda = N2,N7-di(pyrazin-2-yl)-1,8-naphthyridine-2,7-diamine). The central Cr(Ⅲ) ion of 1 is eight-coordinated and is also rare in the chromium complex. The reaction of carbon dioxide with propylene oxide that generates propylene carbonate (PC) when catalyzed by [Cr5(μ5-bpmany)4Cl2]PF6 was investigated. Different reaction conditions including temperature and pressure were studied to optimize the reaction conditions.
SDGs
Type
journal article